ossible to use lock guards for
`pci_rescan_remove_lock` and make use of them in the s390 architecture PCI
implementation.

I've run a /lot/ of tests with affected PCI adapters:
  * enable/disable SR-IOV on the PF;
  * run FLR reset on PF and VF;
  * run Bus reset on PF and VF;
  * run s390's recover SysFS attribute on PF and VF;
  * disable/enable power with the hotplug SysFS attribute on PF and VF;
  * run `zpcictl` with `--reset`/`--reset-fw` on PF and VF;
  * run Configure Off and Configure On on both the PF and VF from a Service
    Element.

There is no more deadlocks and no other lockdep warnings I've witnessed.

Benjamin Block (4):
  PCI: Move declaration of pci_rescan_remove_lock into public pci.h
  s390/pci: Fix circular/recursive deadlocks in PCI-bus and -device
    release
  PCI: Provide lock guard for pci_rescan_remove_lock
  s390/pci: Use lock guard for pci_rescan_remove_lock

 arch/s390/pci/pci.c       | 11 ++++++++---
 arch/s390/pci/pci_bus.c   | 15 ++++++++-------
 arch/s390/pci/pci_event.c | 28 +++++++++++++++++++---------
 arch/s390/pci/pci_iov.c   |  3 +--
 arch/s390/pci/pci_sysfs.c |  9 +++------
 drivers/pci/pci.h         |  2 --
 drivers/pci/probe.c       |  1 +
 include/linux/pci.h       |  5 +++++
 8 files changed, 45 insertions(+), 29 deletions(-)


base-commit: 5ee8dbf54602dc340d6235b1d6aa17c0f283f48c
-- 
2.53.0[PATCH 0/4] PCI: s390/pci: Fix deadlocks on s390 when releasing zPCI-bus or -device objectsBenjamin Block <bblock@linux.ibm.com> undefinedGerald Schaefer <gerald.schaefer@linux.ibm.com>, Vasily Gorbik <gor@linux.ibm.com>, Bjorn Helgaas <bhelgaas@google.com>, Alexander Gordeev <agordeev@linux.ibm.com>, Heiko Carstens <hca@linux.ibm.com>, Niklas Schnelle <schnelle@linux.ibm.com> undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefinedŠ}†ÄK